514 BUREAU OF ANIMAL INDUSTRY. 



somewhat hot and tender, and finally becomes distinctly so, and an 

 abscess is felt, or having broken itself the discharge is seen dripping 

 from a small opening. When the discharge from the nostrils has fully 

 developed the fever usually disappears and the animal regains its appe- 

 tite, unless the swelling is sufficient to interfere with the function of 

 the throat, causing pain on any attempt to swallow. At the end of 

 four or six days the discharge lessens, the soreness around the throat 

 diminishes, the horse regains its appetite, and in two weeks has re- 

 gained its usual condition. Old and strong horses maj- have the disease 

 in so light a form that the fever is not noticeable; they may continue 

 to eat and perform their ordinar}" work as usual and no sj'mptom may 

 be seen beyond a slight, discharge from the nose and a rare cough, 

 ■which is not sufficient to worry any but the most particular owner. 

 But, on the other hand, the disease may assume a malignant form or 

 become complicated so as to l^ecome a most serious disease, and even 

 prove fatal in many cases. Inflammation of the larynx and bronchi, 

 if excessive, will produce violent, harsh coughing, which may almost 

 asphyxiate the animal. The large amount of discharge may be mixed 

 with air by the difficult breathing, and the nostrils, the front of the 

 animal, manger and surrounding objects become covered with a white 

 foam. The inflammation may be in the lung itself {lobular pneumonia) 

 and cause the animal to breathe heavilv, heave at the flanks, and show 

 great distress. In this condition marked symptoms of fever are seen; 

 the appetite is lost, the coat is dry, the horse stands back in its stall at 

 the end of the halter strap with its neck extended and its legs propped 

 apart to favor breathing. This condition may end by resolution, 

 leaving the horse for some time with a severe cough, or the animal 

 mav die from choking up of the lungs (asphyxia). 



The swelling under the jaw may be excessive, and if the abscess is 

 not opened it burrows toward the throat or to the side and causes 

 inflammation of the parotid glands and breaks in annoj'ing fistulas at 

 the sides of the throat and even up as high as the ears. Roaring may 

 occur cither during a moderately severe attack from inflammation of 

 the throat (larynx), or at a later period as the result of continued lung 

 trouble. Abscesses may develop in other parts of the body, in the 

 poll, in the withers, or in the spaces of loose tissue under the arms, 

 in the fold of the thigh, and, in entire horses, in the testicles. 



During the course of the disease, or later, when the animal seems to 

 be on the road to perfect recovery, abscesses may form in the internal 

 organs and produce symptoms characteristic of disease of those parts. 



Roaring, plunging, wandering in a circle, or standing w ith the head 

 wedged in a corner of the stall indicate the collection of matter in the 

 brain. Sudden and severe lung S3'mptoms, without previous dis- 

 charge, ix)int to an abscess between the lungs, in the mediastinum; 

 colic, which is often continuous for days, is the result of the forma- 



